Journal
NANO LETTERS
Volume 20, Issue 1, Pages 701-708Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b04551
Keywords
Li-S batteries; porous membrane; polysulfide trapping; ion channels; phase inversion
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Funding
- Natural Science Foundation of China [21476044, 21676043, 21506028, 21706023]
- Fundamental Research Funds for the Central Universities [DUT18JC14]
- Changjiang Scholars Program [T2012049]
- Welch Foundation [F-1861]
- Camille Dreyfus Teacher-Scholar Award
- Sloan Research Fellowship
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We report here highly scalable yet stackable C/Fe3C membranes with fast ion-transport micro-/nanochannels and polysulfide-trapping networks via a facile phase-inversion process for high-areal-capacity Li-S batteries. The membrane cathodes with aligned channels and hierarchically porous networks significantly promote Li+ and electron transportation and meanwhile trap soluble polysulfide intermediates (LiPSs) effectively via strong chemical adsorption of the doped Fe3C nanoparticles in the membrane toward LiPSs. We further demonstrated that five-layer membrane electrodes with high S loading of 7.1 mg cm(-2) were readily prepared via layer-by-layer stacking of the C/Fe3C membrane, which can deliver a high capacity of 726 mA h g(-1) after 100 cycles, corresponding to an ultra-high-areal-capacity of 5.15 mA h cm(-2) at a low electrolyte/sulfur (EIS) ratio of 6.4 mu L, mg(-1). The scalable multifunctional membrane electrodes with excellent electrochemical performance under high-sulfur-loading and lean electrolyte conditions reveal its promising batteries.
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